# A compass needle is placed in the gap of a parallel plate capacitor. The capacitor is connected to a battery through a resistance. The compass needle 1.  does not deflect 2.  deflects for a very short time and then comes back to the original position 3.  deflects and remains deflected as long as the battery is connected 4.  deflects and gradually comes to the original position in a time which is large compared to the time constant

Subtopic:  Displacement Current |
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Dimensions of 1/(µ0ε0) is

1.   L/T

2.   T/L

3.   L2/T2

4.   T2/L2

Subtopic:  Properties of EM Waves |
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Electromagnetic waves are produced by

1.  a static charge

2.  a moving charge

3.  an accelerating charge

4.  chargeless particles

Subtopic:  Generation of EM Waves |
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An electromagnetic wave going through vacuum is described by

E = E0 sin(kx – ωt); B = B0 sin(kx – ωt).

Then

1.   E0 k = B0  ω

2.   E0 B0 = ωk

3.   E0 ω = B0 k

4.   none of these

Subtopic:  Properties of EM Waves |
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An electric field $$\vec{E}$$ and a magnetic field $$\vec{B}$$  exist in a region. The fields are not perpendicular to each other.

1.  This is not possible.

2.  No electromagnetic wave is passing through the region.

3.  An electromagnetic wave may be passing through the region.

4.  An electromagnetic wave is certainly passing through the region.

Subtopic:  Properties of EM Waves |
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Consider the following two statements regarding a linearly polarized, plane electromagnetic wave:

(A) The electric field and the magnetic field have equal average values.

(B) The electric energy and the magnetic energy have equal average values.

1.  Both A and B are true

2.  A is false but B is true

3.  B is false but A is true

4.  Both A and B are false

Subtopic:  Properties of EM Waves |
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A free electron is placed in the path of a plane electromagnetic wave. The electron will start moving

1.  along the electric field

2.  along the magnetic field

3.  along the direction of propagation of the wave

4.  in a plane containing the magnetic field and the direction of propagation

Subtopic:  Properties of EM Waves |
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A plane electromagnetic wave is incident on a material surface. The wave delivers momentum p and energy E.

1.  p = 0, E  ≠ 0

2.  p ≠ 0, E = 0

3.  p ≠ 0, E ≠ 0

4.  p = 0, E = 0

Subtopic:  Generation of EM Waves |
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An electromagnetic wave going through vacuum is described by

E = E0 sin(kx – ωt)

Which of the following is/are independent of the wavelength?

(a) k
(b) ω
(c) k/ω
(d) kω

Choose the correct option

1. (a), (b)

2. (b), (c)

3. (c) only

4. (a), (d)

Subtopic:  Properties of EM Waves |
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Displacement current goes through the gap between the plates of a capacitor when the charge of the capacitor

(a) increases
(b) decreases
(c) does not change
(d) is zero

Choose the correct option

1. (a), (b)

2. (b), (c)

3. (c) only

4. (a), (d)

Subtopic:  Displacement Current |
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